Auxiliary spindle for grinding wheels



Nov. 19, 1935. J. BATH ET AL AUXILIARY SPINDLE FOR GRINDING WHEELSOriginal Filed March 6, 1933 QN Q a a w...

Patented Nov. 19, 1935 PATENT OFFICE AUXILIARY SPINDLE FOR GRINDINGWHEELS John Bath and Stanley W. Bath, Shrewsbury, Mass., assignors toJohn Bath & Company, Worcester, Mass., a corporation of MassachusettsOriginal application March 6, 1933, Serial No. 659,704. Divided and thisapplication July 5,

1935, Serial No. 29,843

6 Claims. (01. 51-168) This application is a division of our prior appliriggizgon Serial N0. 659,704, filed by us March 6,

N This invention relates to grinding machines 5 I and particularly tothe mounting or support of a grinding wheel therein.

Duplex grinding machines are commonly provided with two grinding heads,each head having its own wheel spindle and each spindle usually 10supporting a separate grinding wheel. It is at times desirable to use asingle extra wide or heavy wheel in a duplex grinding machine and tosupport and drive this single wheel jointly by both wheel spindles.

5 It is the object of our invention to provide an improved auxiliaryspindle for a grinding wheel, adapted to jointly support said wheel onthe two regular wheel spindles of a duplex grinding machine.

2 Our invention further relates to arrangements and combinations ofparts which will be hereinafter described and more particularly pointedout in the appended claims.

A preferred form of the invention is shown in 25 the drawing which is afront elevation, partly in section, showing our improved auxiliaryspindle and associated parts of a duplex grinding machine.

In the drawing we have shown a portion of the 0 frame H] of a duplexgrinding machine and we have shown grinding heads ll slidable forwardand rearward on guideways I3 and I4 formed on upper surfaces of theframe It]. Each wheel head II is provided with bearings for a regularwheel spindle l5, preferably provided with a conical end portion l6which is axially threaded to receive a clamping bolt I1. Each spindle Iis rotated in any convenient manner, as by a pulley l8 and driving beltI9.

40 A clamping bolt 20 is provided for each wheel head ll, said boltbeing threaded into the lower portion of the wheel head and extendingthrough a slot 2| in a portion of the bed I0. By tightening the clampingbolt 23, the wheel head may be firmly secured in any adjusted positionon the guideways l3 and Hi.

We will now describe the special auxiliary spindle construction by whicha wide face or heavy grinding wheel W may be supported by and betweenthe two regular wheel spindles I5. I

For this purpose, we first provide a pair of flanged bushings 22 adaptedto be inserted from each side of the wheel W in an axial opening thereofand to be secured therein by clamping 55 bolts 23 extending throughopenings in one of the bushings and threaded into corresponding openingsin the other bushing.

A supporting member 3|] is secured to each bushing 22 by bolts 3|,suitable provision being made for axiallycentering each member 30 rela-5 tive to its bushing 22. In the drawing we have shown the members 30 asprovided with annular end projections 33 fitting in correspondingrecesses 34 in the ends of the flanged bushings 22.

Each supporting member 30 is provided with a 10 transverse partition orweb 35 having an axial conical opening 36 fitting the conical end 5 ofthe associated regular wheel spindle I5.

Each member 3|] is firmly secured to its associated spindle l5 by one ofthe clamping screws I! previously described. Each screw I1 is providedwith a washer 31 engaging a surface of the partition or web 35. Thesupporting member 30 may also be provided with a longitudinally extendedportion 40 fitting loosely over the end of the wheel spindle bearing andacting to exclude dirt therefrom. Handles 41 are provided forwithdrawing either or both of the wheel spindles l5 axially to permitremoval or replacement of a wheel W.

When our auxiliary spindle is to be used, the wheel heads I I are firstadjusted on their guideways to bring them into accurate axial alignmentand may then be firmly secured in such alignment by the clamping bolt-s20.

From the preceding description it will be evident that we have providedsimple and effective means for firmly supporting a grinding wheeljointly on two associated wheel spindles and for attaining accuratealignment of said wheel spindlesand the auxiliary spindle, so that thesethree parts form in effect a single wheel shaft when the auxiliaryspindle is in use.

' Having thus described our invention and the advantages thereof, we donot wish to be limited 4.0 to the details herein disclosed, otherwisethan as set forth in the claims, but what we claim is:

1. In a grinding machine having two wheel heads each provided with awheel spindle, in combination, an auxiliary wheel spindle comprising apair of flanged bushings, means to clamp said bushings in axial positionin a grinding wheel, a pair of supporting members, means to center andsecured each supporting member on one of said flanged bushings, andmeans to center and secure each of said members on one of said wheelspindles.

2. In a grinding machine having two wheel heads, each provided with awheel spindle having a conical end portion, in combination, an auxiliarywheel spindle comprising a pair of flanged bushings, means to clamp saidbushings in axial position in a grinding wheel, a pair of supportingmembers, means to center and secure each supporting member on one ofsaid flanged bushings, each supporting member having a conical recessfitting the conical end portion of the associated wheel spindle, andmeans to secure each of said members to its associated spindle;

3. In a grinding machine having two wheel heads, each provided with a.wheel spindle, in combination, an auxiliary wheel spindle comprisingmiddle elements secured in axial position in the grinding wheel, endmembers centered and secured to said middle elements, and means tocenter and secure each of said end members to one of said wheelspindles.

4. In a grinding machine having two wheel heads, each provided'with awheel spindle, in combination, an auxiliary wheel spindle comprisingmiddle elements secured in axial position in the grinding wheel andadjustable to different widths of wheel, end members centered andsecured to said middle elements, and means to center and secure each ofsaid end members to one of said wheel spindles.

5. In a grinding machine having two wheel heads, each provided with awheel spindle, in combination, an-auxiliary wheel spindle comprisingmiddle elements secured in axial position in the grinding wheel, endmembers secured to said middle elements, said middle elements and endmembers having cooperating annular end portions by which said endmembers are centered with said wheel, and means to center and secureeach of portion of the associated wheel spindle, and means to securesaid end members to said wheel spindles.

JOHN BATH. STANLEY W, BATH.

'having a conical recess fitting the conical end 20

